no. 1
Some properties of the ring of germs of C ∞ -functions
Compositio Mathematica, Tome 34 (1977) no. 1, pp. 99-108. 
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     author = {Van der Put, M.},
     title = {Some properties of the ring of germs of $C^\infty $-functions},
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     pages = {99--108},
     publisher = {Noordhoff International Publishing},
     volume = {34},
     number = {1},
     year = {1977},
     zbl = {0404.58012},
     language = {en},
     url = {http://www.numdam.org/item/CM_1977__34_1_99_0/}
}
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Van der Put, M. Some properties of the ring of germs of $C^\infty $-functions. Compositio Mathematica, Tome 34 (1977) no. 1, pp. 99-108. http://www.numdam.org/item/CM_1977__34_1_99_0/

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